1276315387 has 2 divisors, whose sum is σ = 1276315388. Its totient is φ = 1276315386.

The previous prime is 1276315373. The next prime is 1276315457. The reversal of 1276315387 is 7835136721.

It is a weak prime.

It is an emirp because it is prime and its reverse (7835136721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1276315387 - 2²⁷ = 1142097659 is a prime.

It is not a weakly prime, because it can be changed into another prime (1276315357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638157693 + 638157694.

It is an arithmetic number, because the mean of its divisors is an integer number (638157694).

Almost surely, 2^1276315387 is an apocalyptic number.

1276315387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276315387 is an equidigital number, since it uses as much as digits as its factorization.

1276315387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 43.

The square root of 1276315387 is about 35725.5564967153. The cubic root of 1276315387 is about 1084.7242142759.

The spelling of 1276315387 in words is "one billion, two hundred seventy-six million, three hundred fifteen thousand, three hundred eighty-seven".